EP3170908A1 - Method for the treatment of a steel slag in steel making - Google Patents
Method for the treatment of a steel slag in steel making Download PDFInfo
- Publication number
- EP3170908A1 EP3170908A1 EP16199415.7A EP16199415A EP3170908A1 EP 3170908 A1 EP3170908 A1 EP 3170908A1 EP 16199415 A EP16199415 A EP 16199415A EP 3170908 A1 EP3170908 A1 EP 3170908A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- glass
- slag
- additive
- waste glass
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000002893 slag Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009628 steelmaking Methods 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 title description 5
- 239000010959 steel Substances 0.000 title description 5
- 239000011521 glass Substances 0.000 claims abstract description 43
- 239000000654 additive Substances 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 15
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- 230000003750 conditioning effect Effects 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 238000005272 metallurgy Methods 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 claims 1
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 239000010433 feldspar Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000005388 borosilicate glass Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000005356 container glass Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Definitions
- the present invention relates to a method for treating a slag in steelmaking.
- additives are added to a slag, among other things, in order to carry out slag conditioning for further processing into marketable products, eg for use in construction.
- slag conditioning for further processing into marketable products, eg for use in construction.
- the state of the art in connection with such a slag conditioning is merely an example WO 00/75385 A1 directed.
- feldspar has a melting temperature well above 1200 ° C
- specially prepared additives such as fluxes based on alkalis (eg Na 2 O, K 2 O) can be added to melt the conditioning agent (eg feldspar) by forming low melting point compounds or eutectic agents.
- At least one additive is added to the slag for slag conditioning.
- the method is characterized in that waste glass is used as additive, wherein the waste glass is used exclusively in the form of hollow glass.
- container and glass packaging in the context of the present application in accordance with the usual terminology container and glass packaging (household jars, bottles, jam jars, vases or the like., But no laboratory or borosilicate glasses) understood.
- borosilicate glasses undesirably attack the materials used during the steelmaking process, such as the melting vessels, which influence the crystal formation of the iron and are also harmful to the environment and hazardous to health.
- flat glass as well as plastic composite glass is avoided in order to avoid undesired pronounced development of smoke and additional CO 2 .
- the invention is based in particular on the concept of using recycled glass as a recycle product instead of natural or specially prepared additives which have been prepared in additional complex mixing processes.
- the invention makes use of the fact that the chemical composition of the waste glass is very well suited to adjusting the basicity of the slag as desired.
- the recycled glass used according to the invention as a recycled product in accordance with form recycled at companies specialized in glass recycling comparatively inexpensive and especially in the required purity (eg exempt of inorganic or organic impurities or impurities) and suitable particle sizes.
- the waste glass can also be used unpurified (since any ceramic or metal components or organic residues which are present are typically not disturbing).
- recycled hollow glass of different origin e.g., a container glass, a packaging glass, a hollow glass
- different colors e.g., brown, green, or white glass
- the addition of the hollow glass takes place during the secondary metallurgy.
- Secondary metallurgy in the context of the present application, in accordance with the usual terminology, means all metallurgical measures used to improve the melt in the steel mill, which are taken after completion of the primary metallurgy carried out in the blast furnace and before transfer to the rolling mill and in which the obtained during tapping liquid pig iron or molten steel is further treated.
- the addition of the hollow glass takes place before the metallurgical treatment in the pig iron ladle.
- the addition of the hollow glass can be done either in the empty pig iron or immediately after filling the pig iron.
- the waste glass has a mean grain size in the range of 1 mm to 100 mm, in particular in the range of 5 mm to 30 mm.
- the use of particle sizes in this area is advantageous in that, when applying additives to the hot melt or slag, there is in principle the risk that these additives are whirled up and thereby contaminate machine components (eg clog a suction device). This can be avoided or at least reduced by the specified, comparatively coarse grain size.
- boron-free used glass is used as additive. This is advantageous in that boron (B) can undergo reaction with the refractory lining material, which can be massively attacked or corroded (whereby the melting point of the refractory lining can also be reduced).
- the waste glass used as additive comprises quartz glass (SiO 2 ), alkali metals (in particular sodium (Na) and potassium (K)), alkaline earth metals (in particular magnesium (Mg) and calcium (Ca)) and aluminum oxide (Al 2 O 3 ) on, wherein the total proportion of other constituents (for example Fe 2 O 3 , TiO 2 or ZnO) is less than 0.5%, in particular less than 0.3%.
- alkali metals in particular sodium (Na) and potassium (K)
- alkaline earth metals in particular magnesium (Mg) and calcium (Ca)
- Al 2 O 3 aluminum oxide
- further additives in particular lime or caustic magnesite, may be added to the melt in order, if desired, to add further desired effects, e.g. to achieve a settling of the melt while avoiding turbulence or removal of further impurities, e.g. in desulfurization.
- the invention is not limited to a specific method with regard to the method used for producing steel but can be used in any method in which a slag is to be conditioned.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Die vorliegende Erfindung betrifft ein Verfahren zur Behandlung einer Schlacke bei der Stahlherstellung, wobei zur Schlackenkonditionierung wenigstens ein Zusatzstoff zu der Schlacke hinzugegeben wird, und wobei als Zusatzstoff Altglas verwendet wird, wobei das Altglas ausschließlich in Form von Hohlglas verwendet wird.The present invention relates to a process for the treatment of a slag in steelmaking, wherein at least one additive is added to the slag for slag conditioning, and wherein waste glass is used as additive, wherein the waste glass is used exclusively in the form of hollow glass.
Description
Die vorliegende Erfindung betrifft ein Verfahren zur Behandlung einer Schlacke bei der Stahlherstellung.The present invention relates to a method for treating a slag in steelmaking.
Bei der Stahlherstellung werden im Stahlwerk u.a. Zusatzstoffe auf eine Schlacke aufgegeben, um eine Schlackenkonditionierung zwecks Weiterverarbeitung zu marktfähigen Erzeugnissen z.B. zur Verwendung im Bauwesen durchzuführen. Zum Stand der Technik im Zusammenhang mit einer solchen Schlackenkonditionierung wird lediglich beispielhaft auf
Des Weiteren ist es bekannt, bei der Behandlung einer Schlacke natürliche Rohstoffe wie z.B. Feldspat zuzugeben, welcher aufschmelzen und die Basizität der Schlacke durch Freigabe von SiO2 ändern soll. Da der Feldspat eine Schmelztemperatur deutlich über 1.200°C besitzt, können eigens hergestellte Zusatzstoffe wie z.B. Flussmittel auf Basis von Alkalien (z.B. Na2O, K2O) hinzugeben werden, um das Aufschmelzen des Konditionierungsmittels (z.B. des Feldspats) durch Bildung niedrigschmelzender Verbindungen bzw. Eutektika zu beschleunigen.Furthermore, it is known in the treatment of slag to admit natural raw materials such as feldspar, which melt and to change the basicity of the slag by release of SiO 2. Since the feldspar has a melting temperature well above 1200 ° C, specially prepared additives such as fluxes based on alkalis (eg Na 2 O, K 2 O) can be added to melt the conditioning agent (eg feldspar) by forming low melting point compounds or eutectic agents.
Aufgrund der erforderlichen Chemikalien sowie auch der Mischvorgänge sind solche Verfahren jedoch aufwändig und kostenintensiv.Due to the required chemicals as well as the mixing processes, however, such processes are complicated and cost-intensive.
Vor dem obigen Hintergrund ist es eine Aufgabe der vorliegenden Erfindung, ein Verfahren zur Behandlung einer Schlacke bei der Stahlherstellung bereitzustellen, welches eine effektive und mit vergleichsweise geringem Aufwand durchführbare Konditionierung ermöglicht.Against the above background, it is an object of the present invention to provide a process for treating slag in steelmaking, which enables effective and comparatively inexpensive conditioning.
Diese Aufgabe wird gemäß den Merkmalen des unabhängigen Patentanspruchs 1 gelöst.This object is achieved according to the features of independent claim 1.
Bei einem erfindungsgemäßen Verfahren zur Behandlung einer Schlacke bei der Stahlherstellung wird zur Schlackenkonditionierung wenigstens ein Zusatzstoff zu der Schlacke hinzugegeben.In a method of treating a slag in steel production according to the invention, at least one additive is added to the slag for slag conditioning.
Das Verfahren ist dadurch gekennzeichnet, dass als Zusatzstoff Altglas verwendet wird, wobei das Altglas ausschließlich in Form von Hohlglas verwendet wird.The method is characterized in that waste glass is used as additive, wherein the waste glass is used exclusively in the form of hollow glass.
Unter "Hohlglas" wird im Rahmen der vorliegenden Anmeldung im Einklang mit der üblichen Terminologie Behälter- und Verpackungsglas (Haushaltsgläser, Flaschen, Marmeladengläser, Vasen o.dgl., jedoch keine Labor- bzw. Borsilikat-Gläser) verstanden.Under "hollow glass" in the context of the present application in accordance with the usual terminology container and glass packaging (household jars, bottles, jam jars, vases or the like., But no laboratory or borosilicate glasses) understood.
Durch die ausdrückliche Beschränkung auf Hohlglas wird erfindungsgemäß dem Umstand Rechnung getragen, dass zum einen Borsilikat-Gläser in unerwünschter Weise die während des Stahlherstellungsprozesses zum Einsatz kommenden Materialien etwa der Schmelzgefäße massiv angreifen würden, die Kristallbildung des Eisens beeinflussen und zudem auch umweltbelastend sowie gesundheitsgefährdend sind. Zum anderen wird auch Flachglas sowie Kunststoff-Verbund-Glas vermieden, um etwa eine unerwünschte ausgeprägte Qualmentwicklung und zusätzliches CO2 zu vermeiden.By expressly limiting this to hollow glass, the circumstance is taken into account according to the invention that borosilicate glasses undesirably attack the materials used during the steelmaking process, such as the melting vessels, which influence the crystal formation of the iron and are also harmful to the environment and hazardous to health. On the other hand, flat glass as well as plastic composite glass is avoided in order to avoid undesired pronounced development of smoke and additional CO 2 .
Der Erfindung liegt insbesondere das Konzept zugrunde, anstelle von natürlichen oder eigens hergestellten und in zusätzlich aufwändigen Mischprozessen aufbereiteten Zusatzstoffen Altglas als Recycleprodukt zu venivenden.The invention is based in particular on the concept of using recycled glass as a recycle product instead of natural or specially prepared additives which have been prepared in additional complex mixing processes.
Hierdurch werden insbesondere natürliche Resourcen geschont. Ferner ist, da das Altglas einen Schmelzpunkt unterhalb von 1.100°C besitzt, keine Zugabe von Flussmitteln erforderlich, zumal Alkalimetalle im Altglas bereits naturgemäß vorhanden sind.This spares natural resources in particular. Furthermore, since the glass has a melting point below 1100 ° C, no addition of flux is required, especially since alkali metals are already naturally present in the glass.
Zudem wird erfindungsgemäß ausgenutzt, dass die chemische Zusammensetzung des Altglases sehr gut dazu geeignet ist, die Basizität der Schlacke wie gewünscht einzustellen.In addition, the invention makes use of the fact that the chemical composition of the waste glass is very well suited to adjusting the basicity of the slag as desired.
Zudem ist das erfindungsgemäß verwendete Altglas als Recycleprodukt in entsprechend (typischerweise durch Trennen, Reinigen, Brechen und Sieben des zuvor z.B. in Containern gesammelten Altglases) aufbereiteter Form bei auf Glas-Recycling spezialisierten Unternehmen vergleichsweise kostengünstig verfügbar und insbesondere auch in der erforderlichen Reinheit (z.B. befreit von anorganischen oder organischen Verunreinigungen bzw. Störstoffen) sowie geeigneten Korngrößen erhältlich.In addition, the recycled glass used according to the invention as a recycled product in accordance with (typically by separating, cleaning, breaking and sieving previously collected eg in containers waste glass) form recycled at companies specialized in glass recycling comparatively inexpensive and especially in the required purity (eg exempt of inorganic or organic impurities or impurities) and suitable particle sizes.
Das Altglas kann gegebenenfalls auch ungereinigt verwendet werden (da gegebenenfalls vorhandene Keramik- oder Metallanteile oder organische Reste typischerweise nicht störend sind).If appropriate, the waste glass can also be used unpurified (since any ceramic or metal components or organic residues which are present are typically not disturbing).
Dabei kann erfindungsgemäß grundsätzlich recyceltes Hohlglas unterschiedlichen Ursprungs (z.B. als Behälterglas, Verpackungsglas, Hohlglas) oder unterschiedlicher Farben (z.B. Braun-, Grün- oder Weissglas) verwendet werden.Basically, recycled hollow glass of different origin (e.g., a container glass, a packaging glass, a hollow glass) or different colors (e.g., brown, green, or white glass) may be used in the present invention.
Gemäß einer Ausführungsform erfolgt die Zugabe des Hohlglases während der Sekundärmetallurgie. Unter "Sekundärmetallurgie" werden im Rahmen der vorliegenden Anmeldung im Einklang mit der üblichen Terminologie sämtliche metallurgische, zur Verbesserung der Schmelze im Stahlwerk eingesetzten Maßnahmen verstanden, welche nach Abschluss der im Hochofen durchgeführten Primärmetallurgie und vor der Überführung in das Walzwerk getroffen werden und bei denen das beim Abstich erhaltene flüssige Roheisen bzw. die Stahlschmelze weiterbehandelt wird. Hierbei erfolgt erfindungsgemäß die Zugabe des Hohlglases vor der metallurgischen Behandlung in der Roheisenpfanne. Hierzu kann die Zugabe des Hohlglases entweder in die leere Roheisenpfanne oder unmittelbar nach dem Befüllen der Roheisenpfanne erfolgen. Eine beispielhafte Analyse der Zusammensetzung von im Rahmen der Erfindung einsetzbarem Hohlglas (Flaschenglas etc.) ist in Tabelle 1 angegeben.
Gemäß einer Ausführungsform wird als Zusatzstoff durch Verkleinerung aufbereitetes Altglas verwendete.According to one embodiment, used as additive by reduction processed recycled glass.
Gemäß einer Ausführungsform weist das Altglas eine mittlere Korngröße im Bereich von 1 mm bis 100mm, insbesondere im Bereich von 5mm bis 30mm, auf. Die Verwendung von Korngrößen in diesem Bereich ist insofern vorteilhaft, als beim Aufgeben von Zusatzstoffen auf die heiße Schmelze bzw. Schlacke grundsätzlich die Gefahr besteht, dass diese Zusatzstoffe aufgewirbelt werden und hierbei Maschinenkomponenten kontaminieren (z.B. eine Absaugeinrichtung verstopfen) können. Dies kann durch die angegebene, vergleichsweise grobe Körnung vermieden oder zumindest vermindert werden.According to one embodiment, the waste glass has a mean grain size in the range of 1 mm to 100 mm, in particular in the range of 5 mm to 30 mm. The use of particle sizes in this area is advantageous in that, when applying additives to the hot melt or slag, there is in principle the risk that these additives are whirled up and thereby contaminate machine components (eg clog a suction device). This can be avoided or at least reduced by the specified, comparatively coarse grain size.
Gemäß einer Ausführungsform wird als Zusatzstoff Bor-freies Altglas verwendet. Dies ist insofern vorteilhaft, als Bor (B) eine Reaktion mit dem Material der feuerfesten Auskleidung eingehen kann, wodurch dieses massiv angegriffen bzw. korrodiert werden kann (wobei auch der Schmelzpunkt der feuerfesten Auskleidung herabgesetzt werden kann).According to one embodiment, boron-free used glass is used as additive. This is advantageous in that boron (B) can undergo reaction with the refractory lining material, which can be massively attacked or corroded (whereby the melting point of the refractory lining can also be reduced).
Gemäß einer Ausführungsform weist das als Zusatzstoff verwendete Altglas Quarzglas (SiO2), Alkalimetalle (insbesondere Natrium (Na) und Kalium (K)), Erdalkalimetalle (insbesondere Magnesium (Mg) und Kalzium (Ca)) und Aluminiumoxid (Al2O3) auf, wobei der Gesamtanteil anderer Bestandteile (beispielsweise Fe2O3, TiO2 oder ZnO) kleiner als 0.5%, insbesondere kleiner als 0.3%, ist.According to one embodiment, the waste glass used as additive comprises quartz glass (SiO 2 ), alkali metals (in particular sodium (Na) and potassium (K)), alkaline earth metals (in particular magnesium (Mg) and calcium (Ca)) and aluminum oxide (Al 2 O 3 ) on, wherein the total proportion of other constituents (for example Fe 2 O 3 , TiO 2 or ZnO) is less than 0.5%, in particular less than 0.3%.
In Ausführungsformen können der Schmelze weitere Zusatzstoffe, insbesondere Kalk oder kaustischer Magnesit, hinzugegeben werden, um gegebenenfalls weitere gewünschte Effekte wie z.B. eine Beruhigung der Schmelze unter Vermeidung von Turbulenzen oder eine Entfernung von weiteren Verunreinigungen zu erreichen, z.B. in der Entschwefelung.In embodiments, further additives, in particular lime or caustic magnesite, may be added to the melt in order, if desired, to add further desired effects, e.g. to achieve a settling of the melt while avoiding turbulence or removal of further impurities, e.g. in desulfurization.
Die Erfindung ist hinsichtlich des jeweils zur Stahlherstellung eingesetzten Verfahrens nicht auf ein bestimmtes Verfahren beschränkt sondern in beliebigen Verfahren anwendbar, in welchen eine Schlacke konditioniert werden soll.The invention is not limited to a specific method with regard to the method used for producing steel but can be used in any method in which a slag is to be conditioned.
Claims (6)
dadurch gekennzeichnet, dass
als Zusatzstoff Altglas verwendet wird, wobei das Altglas ausschließlich in Form von Hohlglas verwendet wird.A process for treating a slag in steelmaking, wherein at least one additive is added to the slag for slag conditioning,
characterized in that
Used as additive waste glass, the waste glass is used exclusively in the form of hollow glass.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015014825.7A DE102015014825A1 (en) | 2015-11-18 | 2015-11-18 | Process for treating a slag in steelmaking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3170908A1 true EP3170908A1 (en) | 2017-05-24 |
Family
ID=57406053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16199415.7A Withdrawn EP3170908A1 (en) | 2015-11-18 | 2016-11-17 | Method for the treatment of a steel slag in steel making |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3170908A1 (en) |
| DE (1) | DE102015014825A1 (en) |
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| CN114716169B (en) * | 2022-05-09 | 2023-06-23 | 山西太钢不锈钢股份有限公司 | Method for reducing high activity alkaline oxide content in steel slag |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4652310A (en) * | 1985-11-20 | 1987-03-24 | Nippon Magnetic Dressing Co., Ltd. | Process for making a hardening agent for weak soil or sludge from steel making slag |
| US4874428A (en) * | 1988-09-12 | 1989-10-17 | Armco Inc. | Fluidizing a lime-silica slag |
| WO2000075385A1 (en) | 1999-06-08 | 2000-12-14 | Voest-Alpine Industrieanlagenbau Gmbh | Method for conditioning slag with the addition of metallurgical residual materials and an installation for the same |
| WO2013127869A1 (en) * | 2012-03-01 | 2013-09-06 | Tata Steel Uk Limited | A method of improving slag skimming performance in a hot metal desulphurisation process |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4123028C1 (en) * | 1991-07-12 | 1992-10-29 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
| DE19624428A1 (en) * | 1996-06-19 | 1998-01-02 | Holderbank Financ Glarus | Pozzolana, synthetic slag, clinker and pig iron production |
| DE19932382A1 (en) * | 1999-07-14 | 2001-01-18 | Asea Brown Boveri | Production of a foamed slag used as a building insulating material comprises forming a liquid slag in a melting furnace, removing as a stream, and spraying with a high speed gas |
| AT412349B (en) * | 2003-06-25 | 2005-01-25 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING AN ALLOYED METAL MELT AND PRODUCTION PLANT THEREFOR |
| EP1960556B1 (en) * | 2005-12-16 | 2014-09-10 | SGL Carbon SE | Method for reprocessing metallurgical dust or grinding dust, and apparatus for carrying out said method |
-
2015
- 2015-11-18 DE DE102015014825.7A patent/DE102015014825A1/en not_active Withdrawn
-
2016
- 2016-11-17 EP EP16199415.7A patent/EP3170908A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4652310A (en) * | 1985-11-20 | 1987-03-24 | Nippon Magnetic Dressing Co., Ltd. | Process for making a hardening agent for weak soil or sludge from steel making slag |
| US4874428A (en) * | 1988-09-12 | 1989-10-17 | Armco Inc. | Fluidizing a lime-silica slag |
| WO2000075385A1 (en) | 1999-06-08 | 2000-12-14 | Voest-Alpine Industrieanlagenbau Gmbh | Method for conditioning slag with the addition of metallurgical residual materials and an installation for the same |
| WO2013127869A1 (en) * | 2012-03-01 | 2013-09-06 | Tata Steel Uk Limited | A method of improving slag skimming performance in a hot metal desulphurisation process |
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| DE102015014825A1 (en) | 2017-05-18 |
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